“PHYSICAL ann LITERARY. 939 
‘daction of an elaftic fluid like air, and a com- 
motion fo great, as to produce fome remarkable 
degree of heat, and in fome cafes fmoak and 
flame : which appearances, I fay, plainly dif- 
cover, that the fmall particles of bodies are 
endowed with fome very active powers, ca- 
‘pable to introduce certain motions tending to 
union or disjun@ion, attraction or repulfion. 
TuHat many parts of matter are endowed 
with an attractive power tending to union 
‘and cohefion, may be deduced from the in- 
{tances already mentioned ; and many more 
might be brought from occurrences in che- 
miftry to confirm the fame. That other 
parts of matter are endowed with an elaftic 
or repelling force, may be concluded from 
the properties of air and light; demonftrated 
_ bythe greateft philofophers of the laft and 
- iprefent age. » The curious experiments . of 
the ingenious Dr Hales, in his. Analyfis of 
the air, and the furprifing experiments on 
eleGricity. now fo much in vogue,. may 
 fatisfy us, that. particles of the fame nature 
and qualities with thofe of air/and light, may 
_ be! joined to particles of a grofler nature 
and. attractive, quality, in. various mafles of 
“matter, to fome adhering more loofely, to a- 
thers 
